Pump jack



March 8,1927. 0 9.

M. L. DOBSON PUMP JACK Filed Dec; 7 1926 4 Sheets-Shet 1 lnventar A Q g fizwaaiiw.

Attamqy March 8, 19 27. M- L DOBSON PUMP JACK Filed Dec. v. 1926 4 Sheets-Sheet Inventor Mar/'0 Zea D0 A'ttorngay I *1;e20,0o9 March 8, 1927. M. L DOBSON PUMP JACK Filed Dec. '7. 1926 4 Sheets-Sheet 3 Attohzqy I Inventor March 8, 1927. 9 M. L. DOBSON PUMP JACK Filed Dec. v 1926 4 Sheets-Sheet 4 Inventor /10/76 7 Zea @0660 B fianwmn. v A ttormgy A ENT UFFICE.

MARION LEE DOFBSON, 0F KEVIN; MONTANA.

PUMP JACK.

Application filed December 7, 1926. Serial No. 153,115.

This invention relates to what is well defined in the art as a pump jack, and has more particular reference to a structure adapted to impart a true perpendicular movement to the polish rod of the pump, the structure being designedfor decidedly multiplying the leverage in order to insure a powerful stroke of the pump plunger.

My principal aim is to generally improve upon structures of this kind'by providing one possessing a new arrangement of details thought to be superior to prior known and patented structures of the same class, the same having been carefully designed after considerable experimentation in power transmission and multiplication of leverage.

The particular details and novel association thereof will become readily apparent from the following description and drawings. V

In the accompanying drawings forming a part of this application and in which like numerals are employed to designate like parts throughout the same:

Figure 1 is a sideview of one embodiment of the invention showing the complete structure, and the manner in which it is associated with the pump polish rod.

Figure 2 is a top plan view of the same.

Figure 3 is a section taken on the plane of the line 3-3 of Figure 1 looking in the direction from right to left.

Figure t is an enlarged detail cross section taken on the line 4 4 of Figure 1 to show the counterbalance structure plainly.

Figure 5 is a horizontal sectiontaken on the line 55 of Figure 1.

Figure 6 is a perspectiveview of one of the details.

Figure 7 is a perspective viewof the'end of the walkin beam which is connected with the polish rod.

Figure 8 is a perspective View of the clamping means connected with the polish rod. i l

Figure 9 is a side elevation of a slightly different embodiment of the invention for light weight work.

Figure 10 is an end view of the same looking in a direction from right to left of Figure 9.

Attention is first-to be confined to Figures 1 to 7 inclusive, wherein it will be seen that the reference characters 1 designate a" pair of spaced parallel channel bars functioning as base rails of the supporting struc-.

ture. The supporting structure also includes a pair of rearwardly inclined upwardly converging uprights .2, the upper the lower intermediate portions ofthe uprights 2 and to an adjacent portion of the base rails 1 areinclined standards 41 upon which a lever 5 isrockably mounted as at 6. It will be noticed that the lower por tion of this lever carries a notched block 7 with which a loop 8 on one end of the power supply cable 9 is engaged, as shown in Figure 1. An arouate head 10 is connected with the upper end of the lever and a bracing link 11 is connected with this head and with a collar 12 which is adjustably mounted on the portion of the lever below the pivotal connection 6, as shown in Figure 1. This lever 5 is connected with the walking beam 13 through the medium of a pull cable 1 1,- this cable carrying a loop 15 connected with the notched lower end 16 of one of the diagonal brace rods 17. These brace rods are connected with a power transmitting arm 18 which is in turn connected with the pivotal mounting of the walking beam 13 as shown better in Figure 3. The walking beam is mounted by a pivotal support 19 on the upper end of the upright 2.

At this time I would call attention to the provision of a-slot 20 in the left hand end of the walking beam upon which a counter balance weight 21 is mounted. Thisweight as'better shown in Figure 4 includes a pair of disks 22 connected by a bolt 23 which is slidable in the slot.

Secured to the opposite end of the walking beam is a means represented generally by the reference character 2 for connecting the device with the polish rod 25 of the pump. This means comprises a body including a pair of arcuate channel shaped tracks 26, the body being bent somewhat into U-shaped formation as represented in Figure 7 to al-- lift to the polish rod at all times and serves to prevent under wear on the stufiing box on the upper end of the Well casing 30, as shown in Figure 1. If desired, a bracing link 31 may be disposed between the upper end of this connecting means 24 and the adjacent portion of the walking beam.

From the foregoing description it is obvious that the power stroke is transmitted through the cable 9, the operating lever 5, the pull cable 14 and the operating arm 18 to the walking beam 13. Inasmuch as this walking beam is connected with the polish rod, it is obvious that the latter will be reciprocated in a well known manner. The sensitivity of the operation of the walking beam may be varied somewhat by adjusting the counterbalancing weight device 21.

As before stated, it is believed that by transmitting the power through this particular mechanism, the leverage is decidedly multiplied in a manner to insure positive and dependable operation of the polish rod of the pump. The flexible connection between the walking beam and the polish rod through the medium of the flexible element clamping means aids in this free but true operation of the polish rod.

Referring now to Figure 9 it will be seen that a slightly different embodiment of the invention is shown. As seen here, the reference character 31 is employed to represent the base rail, 32 the uprights, 33 the braces, 84 the operating arm, and 35 the pivotal connection of the beam 36. As shown the beam is simply provided with a notched end at 37 with which the aforesaid flexible element 28 is connected. Here, the special clamping means 24; is dispensed with. It will also be noticed that the operating lever 38 is connected directly with the pull cable 39 which'is in turn connected with the operating arm 34 through the medium of a notched block. The power transmitting cable 40 is connected with the lever through the medium of a notched block, in the manner already described. The distinction here is that the special head and link 10 and 11 already described is dispensed with. Otherwise the parts are the same.

It is though that by carefully considering the description in connection with the drawing a clear understanding of the invention will doubtless be had, therefore a more lengthy description is thought necessary. 7

While the preferred embodiment of the invention has been shown and described it is to be understood'that minor changes coming within the field of invention claimed may be resorted to if desired.

Having thus described the invention, what I claim is .1. In a pump jack, a supporting structure including spaced rails, uprights rising therefrom and connected thereto, a beam pivotal- 1y mounted on the upper ends of the uprights and provided at one end with-means for connecting with a reciprocatory polish rod, and power multiplying means mounted upon said upright and connected with said beam adjacent its point of pivotal connection with said uprights.

2. In a pump jack structure of the class described, a supporting structure embodying base rails, uprights rising from said'rails and connected thereto, bracing means for said uprights, a beam pivotally mounted upon the uprights, a depending operating arm connected with the beam adjacent its point of pivotal connection with said uprights, a lever supported from said uprights, a power transmitting cable connected with one end of the lever, and a pull cable connected with the opposite end of the lever and with the lower end of said operating arm.

3. In a pump jack of the class described, a pair of spaced parallel base rails, rearwardly inclined uprights connected thereto and rising therefrom, braces connected to the upper ends of the uprights and connected at their lower ends to said base rails, a beam pivotally connected to the upper ends of the uprights, a right angularly disposed operating arm connected to and depending from the beam adjacent its point of pivotal connection to said upright, and means for im'- parting rocking movement to said arm supported from said uprights.

4. In a pump jack of the class described, a supporting structure including a pair of base rails, uprights rising from and con nected to said rails, a beam pivotally mounted upon said uprights, an operating arm for the beam disposed at right angles to the latter and depending therefrom, a vertically disposed operating lever pivotally supported from said uprights, a power transmitting cable connected to the lower end of said lever, and an operating connection between the upper end of the lever and the lower end of said arm.

5. In a pump jack structure of the class described, a supporting structure including base rails, rearwardly inclined uprights rising therefrom, inclined braces connected to the upper ends of the uprights depending therefrom and connected at their lower ends with said rails, a beam pivotally connected to the upper end of the uprights, an operating arm connected to and depending from said beam adjacent its point of pivotal connection with said uprights, forwardly inclined standards rigidly connected to the rails and lower portion of said uprights, a lever pivotally mounted on said standards, power transmitting cables adjustably connected to the lower end of the lever, and an operating connection between the upper end of the lever and the lower end of said arm.

6. In a pump jack structure of the class described, a supporting structure embodying a pair of spaced parallel base rails, rearwardly inclined uprights connected to and rising from said base rails, braces connected to the upper ends of the uprights and depending therefrom and connected to said base rails, a walking beam pivotally mounted between its ends on the upper ends of said uprights, counter-balancing means on one end of the beam, and means on the opposite end of the beam for affording a detachable and pivotal connection with a polish rod, an operating arm rigidly connected to the central portion of the walking beam adjacent its pivotal mounting depending at right angles from said beam, a pivotally mounted operating lever supported from said uprights, an operating connection between the lever and the lower end of said 20 arm, and a power transmitting cable pivoted to the lower end of said lever.

In testimony whereof I afiix my slgnature.

MARION L. DOBSON. 

